This bill aims to revise the laws governing utility lines and facilities in Montana by allowing the Public Service Commission to grant public utilities a Certificate of Public Convenience and Necessity for the construction of electric transmission facilities. It introduces optional ratemaking procedures and timelines, establishes definitions for key terms, and provides the commission with rulemaking authority. The bill emphasizes the importance of advanced transmission technology, which enhances capacity, efficiency, and reliability while reducing wildfire risks. It also seeks to expedite necessary upgrades to the transmission infrastructure to meet the growing demand for power.

Key changes in the bill include the removal of certain definitions related to energy storage devices and distributed generation, while expanding the definition of "advanced transmission technology" to include various innovative technologies. The bill modifies the timeline for the commission to determine the public interest in proposed transmission facilities from 270 to 300 days and mandates that the commission consider specific factors, such as the need for reliable service and the anticipated costs and benefits of the proposed facilities. Additionally, it introduces a process for public utilities to apply for advanced cost approval of transmission lines, establishing a presumption of prudence for costs that do not exceed approved amounts. The act is set to take effect immediately upon passage and approval.